According to them, they didn't. They say that they have techs there for the alarms. But at this point I've lost faith in their service department (we had a terrible job done to one of our trucks and has now been resolved, nevertheless, it's inconvenient having to pick up the car and then bring it again for the same problem) and accessories department (had to take this alarm problem more than once as well, because according to them, in order to find the problem they have to do trial and error. First trying to fix it one way and then if that doesn't work, then try another solution.), so who knows how it is.

I had someone drop off the car this morning. We'll see what they tell me in the afternoon and if they are able to solve the problems.

The alarm didn't go off on its own this weekend, so what they have to correct is the buzzing sound and get the mirror replaced.

*UPDATE*
My salesman called me this afternoon telling me the buzzing sound problem was resolved. They said that it indeed was their fault. The tech was in such a hurry to leave that he left the module that detects when the door is closed (enlighten me someone with this, I haven't heard of this before) out of the assembly, but now that has been restored it is ready to go.
They will replace the mirror and deliver it to me tomorrow because they ordered it overnight. Let's see how everything plays out tomorrow when I pick it up.

*UPDATE*
My salesman called me this afternoon telling me the buzzing sound problem was resolved. They said that it indeed was their fault. The tech was in such a hurry to leave that he left the module that detects when the door is closed (enlighten me someone with this, I haven't heard of this before) out of the assembly, but now that has been restored it is ready to go.
They will replace the mirror and deliver it to me tomorrow because they ordered it overnight. Let's see how everything plays out tomorrow when I pick it up.

Hello onesimo3,

We are pleased to learn that the dealer has resolved the issue for you. We are anxious to hear how this situation concludes upon picking up your vehicle. If there is anything we can assist you with, please let us know.

We are pleased to learn that the dealer has resolved the issue for you. We are anxious to hear how this situation concludes upon picking up your vehicle. If there is anything we can assist you with, please let us know.

Reggie B.
Chevrolet Customer Care

Well, just picked up my car, the buzzing sound stopped. They told me that the Remote Start Module was defective and that it was detecting that a door was open and that for that same reason, the alarm kept going off by itself at night.

They indeed replace the mirror free of charge (maybe somebody confessed to having broken it??)

Both my salesman and the service department made their best efforts to provide a great customer experience (more than I can say for the first time around) which gave me peace on mind that my vehicle and my business are in good hands.

The only complain I have is that once again they left the shock sensor at the minimum level to where the only way it will sound is if they break the window... Will stop by again on Friday so that they can rise the sensitivity of the alarm a little bit. (I don't want the alarm to go off after they break a window...)